* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #f4f6fa; color: #1f2937; }

/* Login */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: #1e293b; }
.login-card { background: #fff; padding: 2rem; border-radius: 12px; width: 100%; max-width: 380px; box-shadow: 0 10px 30px rgba(0,0,0,.2); }
.login-card h1 { margin-bottom: 1.5rem; text-align: center; }
.login-card label { display: block; margin-bottom: 1rem; font-size: .9rem; color: #4b5563; }
.login-card input { width: 100%; padding: .7rem; margin-top: .3rem; border: 1px solid #d1d5db; border-radius: 8px; }
.login-card button { width: 100%; padding: .8rem; background: #2563eb; color: #fff; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; }
.login-card button:hover { background: #1d4ed8; }
.alert { padding: .7rem; border-radius: 8px; margin-bottom: 1rem; font-size: .9rem; }
.alert-error { background: #fee2e2; color: #991b1b; }

/* Layout */
.app { display: flex; min-height: 100vh; }
.sidebar { width: 240px; background: #111827; color: #e5e7eb; padding: 1.2rem 0; }
.brand { padding: 0 1.2rem 1rem; font-weight: 700; font-size: 1.1rem; border-bottom: 1px solid #1f2937; }
.sidebar nav { display: flex; flex-direction: column; margin-top: .5rem; }
.sidebar nav a { padding: .65rem 1.2rem; color: #cbd5e1; text-decoration: none; font-size: .92rem; }
.sidebar nav a:hover { background: #1f2937; color: #fff; }
.content { flex: 1; display: flex; flex-direction: column; }
.topbar { background: #fff; padding: .8rem 1.5rem; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #e5e7eb; }
.btn-logout { color: #dc2626; text-decoration: none; font-size: .9rem; }
.page { padding: 1.5rem; }
.page h1 { margin-bottom: 1rem; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.card { background: #fff; padding: 1rem; border-radius: 10px; box-shadow: 0 1px 3px rgba(0,0,0,.06); display: flex; flex-direction: column; gap: .3rem; }
.card span { font-size: .85rem; color: #6b7280; }
.card strong { font-size: 1.3rem; }